* lisp/cedet: Remove always-nil variables

* lisp/cedet: Remove always-nil variables

* lisp/cedet/ede/pmake.el (ede-proj-makefile-insert-variables):
Remove always-nil variable `conf-done`.

* lisp/cedet/ede/project-am.el: Use ref instead of dynbound var.
(project-rescan): Pass the ref.
(project-am-expand-subdirlist): Use it.

* lisp/cedet/semantic/idle.el (semantic-idle-work-core-handler):
Fix misuse of the wrong `errbuf `variable.

* lisp/cedet/semantic/scope.el (semantic-analyze-scoped-type-parts):
Remove always-nil variable `extmeth`.

* lisp/cedet/semantic/wisent/comp.el (wisent-context-name)
(wisent-context-bindings): Make them into functions.
(wisent-with-context): Use `dlet`.